期刊
ULTRASONICS SONOCHEMISTRY
卷 33, 期 -, 页码 90-98出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2016.04.028
关键词
Sonochemical degradation; Bi2WO6; Ultrasonic irradiation; Methyl orange; Reactive oxygen species
资金
- Startup Foundation for Doctors of Shenyang University of Chemical Technology
The Bi2WO6 was prepared by the hydrothermal method and its sonocatalytic activity was studied in the degradation of methyl orange (MO) solutions. The effects of catalytic activity of Bi2WO6 on dye were inspected by the change in absorbance of dye with UV-vis spectrometer. The influences of operational parameters such as the addition amount of Bi2WO6, pH, the initial concentration of dyes, ultrasonic power and irradiation time on the degradation ratio were investigated. In addition, the obtained results indicated that the kinetics of sonochemical reactions of MO were consistent with the pseudo first-order kinetics and Bi2WO6 had excellent reusability and stability during the sonochemical degradation processes. The generation and kinds of reactive oxygen species (ROS) and their influence on the sonochemical degradation of MO were determined by the methods of oxidation-extraction spectrophotometry and ROS scavengers. The results indicate that the degradation of MO in the presence of Bi2WO6 under ultrasonic irradiation is related to the generation of ROS, in which both singlet molecular oxygen (102) and hydroxyl radical ((OH)-O-center dot) play important roles in the sonochemical degradation of MO. These experimental results provide a sound foundation for the further development of Bi2WO6 as a sonocatalyst in wastewater treatment. (C) 2016 Elsevier B.V. All rights reserved.
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